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- Title
A cumulative search for hard X/γ-ray emission associated with fast radio bursts in Fermi/GBM data.
- Authors
Martone, R.; Guidorzi, C.; Margutti, R.; Nicastro, L.; Amati, L.; Frontera, F.; Marongiu, M.; Orlandini, M.; Virgilli, E.
- Abstract
Context. Fast radio bursts (FRBs) are millisecond-long bursts uniquely detected at radio frequencies. FRB 131104 is the only case for which a γ-ray transient positionally and temporally consistent was claimed. This high-energy transient had a duration of ∼400 s and a 15–150 keV fluence Sγ ∼ 4 × 10−6 erg cm−2. However, the association with the FRB is still debated. Aims. We aim at testing the systematic presence of an associated transient high-energy counterpart throughout a sample of the FRB population. Methods. We used an approach like that used in machine learning methodologies to accurately model the highly-variable Fermi/GBM instrumental background on a time interval comparable to the duration of the proposed γ-ray counterpart of FRB 131104. A possible γ-ray signal is then constrained considering sample average lightcurves. Results. We constrain the fluence of the possible γ-ray signal in the 8–1000 keV band down to 6.4 × 10−7 (7.1 × 10−8) erg cm−2 for a 200-s (1-s) integration time. Furthermore, we found the radio-to-gamma fluence ratio to be η > 108 Jy ms erg−1 cm2. Conclusions. Our fluence limits exclude ∼94% of Fermi/GBM detected long gamma-ray bursts and ∼96% of Fermi/GBM detected short gamma-ray bursts. In addition, our limits on the radio-to-gamma fluence ratio point to a different emission mechanism from that of magnetar giant flares. Finally, we exclude a γ-ray counterpart as fluent as the one possibly associated with FRB 131104 to be a common feature of FRBs.
- Subjects
UNITED States. Federal Reserve Board; GLIOBLASTOMA multiforme; GAMMA ray bursts; RADIO frequency; GAMMA rays; RADIOS; NURSING databases
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2019, Vol 631, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201936284